How to weld nickel sheets for batteries

Spot welding:

Spot welding is a traditional welding method, also known as resistance welding. It utilizes the principle of resistance heating to heat and melt the welding material through the interaction of current and resistance, thereby achieving a firm connection. Spot welding method is particularly suitable for welding steel shell cylindrical battery cells, such as small electric vehicle battery packs, energy storage batteries, and household appliances. 
When using a spot welding machine to weld nickel sheets, it is necessary to adjust the current, which is usually determined by the specific equipment and the material of the nickel sheet. For example, in the video, it is shown using the Golinde 801D spot welding machine and adjusting the current to 40A for welding. 
The advantages of spot welding are simple operation, high efficiency, and suitability for mass production.
Laser welding:

Laser welding utilizes the excellent directionality and high power density of laser beams for operation. Through an optical system, the laser beam is focused on a very small area, quickly forming a highly concentrated heat source zone, causing the welded object to melt and form a solid weld and seam. Laser welding is usually suitable for the assembly and welding of large aluminum shell monolithic or soft pack batteries, such as large electric vehicle battery packs, electric vehicles, and large energy storage power sources. 
The advantages of laser welding include high energy density, rapid heating, large welding depth, and small heat input, which can reduce the thermal deformation and damage of nickel sheets, ensuring welding quality and accuracy. 
When choosing the appropriate welding method, decisions should be made based on specific needs. Cylindrical batteries are usually assembled using spot welding, while aluminum shell and soft pack batteries tend to use laser welding. In addition, nickel sheet welding machine is an efficient welding equipment, which works by passing current through the nickel sheet to produce a molten state, thereby achieving the purpose of welding.